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2005 pro plow on 2011 2500HD

I am looking at picking up another truck. We have a 2005 8' pro plow that we can put on it if we decide not to just buy a new plow. It has the 4 port isolation setup. Can everything truckside be setup with a 3 port setup and is there any benefit to either? Other option is working the wiring with new plugs. Advice?